3500E Marine Engines Alarms and Shutoffs Caterpillar


Alarms and Shutoffs
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1.1. Aftertreatment Emission Fault Codes

This section contains some general information about the function of typical engine protective devices.

Alarms and shutoffs are electronically controlled. The operation of all alarms and shutoffs utilizes components which are actuated by a sensing unit. Alarms and shutoffs are set at critical operating temperatures, pressures, or speed to protect the engine from damage.

The alarms function to warn the operator when an abnormal operating condition occurs. The shutoffs function to shut down the engine when a more critical abnormal operating condition occurs. The shutoffs help to prevent damage to the equipment.

If an engine protective device shuts off the engine, always determine the cause of the shutoff. Make the necessary repairs before attempting to start the engine.

Become familiar with the following information:

  • Types of the alarm and shutoff controls

  • Locations of the alarm and shutoff controls

  • Conditions which cause each control to function

  • Resetting procedure that is required before starting the engine

For information about the specific alarms and shutoffs for the engine, see this Operation and Maintenance Manual, "Monitoring System" topic (Operation Section).

Aftertreatment Emission Fault Codes

Per EPA requirements, the engine alarms and records in nonvolatile memory the emission codes listed in table 1.

Table 1
Aftertreatment Codes 
CDL-WCI  SPN (Suspect Parameter Number) - FMI (J1939)  SPN Description  Accumulated Counter SPN 
1364-2  3516-18  Aftertreatment No.1 DEF Concentration: Low - Moderate Severity (2)  6818 
946-2  4360-0  Aftertreatment No. 1 SCR Catalyst Intake Temperature: High - Medium Severity (1)  8327 
955-3  4367-1  Aftertreatment No. 1 DEF Tank No. 2 Level: Low - Most Severe (3)  6817 

As per 40 CFR 1042.660(b), owners and operators are required to report to the EPA, within 30 days, instances where the engine has been operated without a sufficient supply of DEF that meets the manufacturers quality specifications. For DEF quality specifications, refer to this Operation and Maintenance Manual , Fluid Recommendations section. The codes listed in table2 can be an indication of insufficient DEF quality or quantity that the EPA or Coast Guard may review. Refer to the applicable Troubleshooting guide to interpret the codes.

Table 2
Aftertreatment Codes 
CDL-WCI  SPN-FMI (J1939)  SPN Description 
1364-2  3516-18  Aftertreatment No.1 DEF Concentration: Low - Moderate Severity (2) 
955-3  4367-1  Aftertreatment No.1 DEF tank No.2 Level: Low - Most Severe (3) 

In unusual circumstances, other root causes can trip these codes. Assessing and addressing these codes in a timely fashion is important. AVSpare recommends that at a minimum, each instance should be recorded in the ships log, with the reason for the code, and any proof that acceptable DEF was provided. If the reason for the code is that the owner or operator did not provide sufficient DEF of the required quality, then a report should be sent to the EPA Designated Enforcement Officer within the 30-day window at:

Director
Air Enforcement Division
U.S. Environmental Protection Agency
1200 Pennsylvania Ave. NW.
Washington, DC 20460

The following examples are codes that may not require reporting.

  • Operation of an engine under a valid test exemption.

  • Operation during engine commissioning.

  • SCR system failure

The accumulated counters are displayed on the control panel as shown in illustration 1.



Illustration 1g06318883
Typical example of accumulated counters on the control panel.

Add "Primary" totals (3) to "Backup ECM" totals (1) for the correct amount of time out of compliance. Fluid quality counter (2) adds ECM totals together. Do not add "Primary" DEF quality counter to "Backup ECM" DEF quality counter.

Table 3
Setpoints for Aftertreatment 
Condition  Parameter  Application  Alarm Setpoint (Default)  Derate Setpoint (Default)  Shutoff Setpoint (Default) 
High(1)  SCR Inlet Temperature    500° C (932° F)     
High(2)  SCR Inlet Temperature    525° C (977° F)     
High(3)  SCR Inlet Temperature    575° C (1067° F)     
Low  SCR Inlet Temperature    Map - On     
High  SCR Outlet Temperature    Map - On     
High  SCR Outlet Temperature    Map - On     
High  SCR Outlet Temperature    Map - On     
Low  SCR Outlet Temperature    Map - On     
High  DEF Pressure    Map - On     
Low  DEF Pressure    Map - On     
High  DEF Dosing Air Pressure    450 kPa (65.3 psi)     
Low  DEF Dosing Air Pressure    400 kPa (58 psi)     
Low  DEF Dosing Air Pressure    275 kPa (40 psi)     
High  DEF Concentration    Map - On     
Low  DEF Concentration    Map - On     
High  DEF Manifold Temperature    50° C (122° F)     
Low  DEF Manifold Temperature    −5° C (23° F)     
Low  DEF Manifold Temperature    −10° C (14° F)     
High  CEM Inlet Air Pressure    Map - On     
Low  CEM Inlet Air Pressure    Map - On     
Low  DEF Buffer Tank Level    14 percent     
Low  DEF Buffer Tank Level    7 percent     
Low  DEF Buffer Tank Level    0 percent     
High  DEF Bulk Tank Level Switch    Closed     
Low  DEF Bulk Tank Level Switch    Closed     
High  NOx Conversion    Map - On     
Low  NOx Conversion    Map - On     
Low  Tank Temperature    −6° C (21.2° F)     
Low  Tank Temperature    −8° C (17.6° F)     
Low  Tank Temperature    −9° C (16° F)     
High  Tank Temperature    50° C (122° F)     
(1) Low
(2) Medium
(3) High

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